POST MORTEM VARIATION OF TOTAL VOLATILE BASE NITROGEN (TVB-N) AND TRIMETHYLAMINE NITROGEN (TMA-N) IN VETKI (Lates calcarifer)

Total Volatile Base Nitrogen (TVB-N) and Trimethylamine (TMA-N) contents of Vetki (Lates calcarifer) were investigated following Conway’s Microdiffusion technique at 4 hour interval in Fish Quality Control Laboratory, Fisheries Marine Resource Technology Discipline, Khulna University. Observed TVB-N TMA-N value did not vary significantly among different size classes. At fresh condition, content was observed as 11.106±0.8 mg, 11.162±0.8 mg small, medium large classes fish respectively it increased to 59.087±0.8 68.417±1.5 75.967±2.7 for 100 g-1 complete spoilage stage (after 28 hrs). TMA–N 6.7±0.016 11.069±1.79 11.172±1.01 48.893±3.01 52.492±.089 57.717±1.95 stage. values started increase gradually all groups with the passage time but rate became faster after 20th continued till final reached.